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TOSA Transmitter Optical Sub

TOSA Optical Subassembly is mainly composed of a laser, a tube sleeve and an adapter, as well as an isolator and a regulating ring in a long-distance optical module, with a light source (semiconductor light-emitting diode or laser diode) as the core. The LD chip, monitoring photodiode (MD) and lens assembly are packaged in a compact structure (TO coaxial package or butterfly package), and the TOSA is mainly used for converting electrical signals into optical signals (E/O conversion), where the TOSA lens assembly usually encapsulates a microlens in a coaxial metal shell. Microlens using high temperature molding, the advantages are low production cost, high precision, suitable for aspherical microlens mass production. The TOSA lens assembly is one of the core components of a variety of optical systems, mainly for the conversion of electrical signals into optical signals (E/O conversion).

transmitter optical sub assembly
transmitter optical subassembly

Specifications of TOSA


TOSA lens assembly parameter table
projectIndicator requirements
1. MaterialUse various high and low refractive index optical glass and stainless steel, SF20F and other metal housings
2. Outer diameterRound OD≤20mm
3. Thicknessaccording to customers needs
4. Effective focal lengthaccording to customers needs
5. Working distanceaccording to customers needs
6. Design wavelengthaccording to customers needs
8. CoatingAR anti-reflection coating R<0.5% @λnm according to customer requirements
9. Eccentricityaccording to customers needs
10. Effective apertureED>90% aspheric area
11. Surface shapeUltra-high precision Rt≤0.1μm, high precision Rt≤0.5μm, precision Rt≤1μm
12.Surface quality60-40, 40-20, 20-10, 10-5


Dimension Drawing of TOSA

Dimension Drawing of TOSA

Features of TOSA

Features of TOSA
  • One-stop customized production: Solar Valley processes TOSA lens components of various sizes and structures according to customer requirements, and the optical surface of the lens can be spherical and aspherical.

  • Material: Use a variety of high and low refractive index optical glass and metal material coaxial shell.

  • TOSA lens assembly performance: Tianyang Valley strictly matches TOSA lens assembly diameter and center thickness to ensure package quality and high precision required center thickness. Using various packaging technologies such as UV curing, gluing and high temperature powder curing in different glass and metal coaxial housings, Tianggu accurately controls the focal length and various optical properties of TOSA lens components.

  • Product size indicator description:

    TOSA lens assembly maximum dimensions: OD≤φ20mm

    TOSA lens assemblies can achieve the following accuracy levels according to customer requirements:

    Ultra-high precision: surface shape error < 0.1μm, surface roughness < 0.01μm

    High precision grade: Surface error < 0.5μm, surface roughness < 0.05μm Precision grade: Surface error < 1μm, surface roughness < 0.1μm


  • Surface defect grade: 60-40, 40-20, 20-10, 10-5 According to customer requirements.

  • Coating: Coating according to customer requirements.

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